Hi all, I just stumbled on this. I am building org (Org-mode version 7.9.2 release_7.9.2-585-g3d56f5) now basically with 'ORG_ADD_CONTRIB = org*' in local.mk (not sure if that is relevant, though).
When I call org-reload the new exporter forgets all loaded backends and even re-evaluating (require 'org-e-latex), etc. does not bring them back. Regards, Andreas